package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.controller.admin.DishController;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishController dishController;

    /**
     * 新增菜品和对应口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入一条数据
        dishMapper.insert(dish);

        Long dishId = dish.getId(); //获取上面insert语句生成的主键值

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品分页查询
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除？  起售中？
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品起售中，不允许删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除？  是否被套餐关联？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        for(Long id : ids) {
//            dishMapper.deleteById(id); //删除菜品表中的菜品数据
//            dishFlavorMapper.deleteByDishId(id); //删除上面删除的菜品关联的口味数据,如果有的话
//        }
        // 优化上面的for循环,做批量删除
        dishMapper.deleteByIds(ids);// delete from dish where id in (?,?,?)
        dishFlavorMapper.deleteByDishIds(ids); // delete from dish_flavor where dish_id in (?,?,?)
    }

    /**
     * 起售停售菜品
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .updateTime(LocalDateTime.now())
                .updateUser(BaseContext.getCurrentId())
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据id获取菜品
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id); //根据id查询菜品基础数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id); //根据id查询关联的口味数据

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO); //拷贝 dish-菜品基础数据 到 dishVO
        dishVO.setFlavors(dishFlavors); //设置 dishFlavors-关联的口味数据 到 dishVO
        return dishVO;
    }



    /**
     * 根据id修改基本的菜品信息和对应的口味信息
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO){
        //修改菜品表基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        //删除原有口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
